A UWB antenna combined with a reconfigurable bandpass filter for cognitive radio applications

A Novel Octagonal UWB Antenna for Cognitive Radio

“…In [9] a wideband circular monopole and a narrowband dipole antenna for cognitive radio were presented with impedance bandwidth of the wideband monopole antenna is from 4.25-10GHz and narrowband dipole antenna's central frequency is 5.8GHz. A single-port small-size antenna based on an ultra-wideband (UWB) design and has a reconfigurable band pass filter integrated in its feed line for cognitive radio (CR) applications is presented in [10]. In [11] wideband, multi-band or reconfigurable antennas have been developed and when considering the interference levels at the receiver, reconfigurable antennas are the best option, since only one single band is used at a given time.…”

A Reconfigurable Cedar-Shaped Microstrip Antenna for Wireless Applications

“…Frequency reconfigurability is usually achieved by incorporating switches across slots such as MEMS switches and p-i-n diodes. In [7], the authors present a PCB with electronic switches placed across slots in the feed line for Cognitive Radio applications. Optical switching was also used in [8] to obtain frequency reconfigurability where laser diodes were embedded in the substrate.…”

Reconfigurable Filter Antennas for Pulse Adaptation in Uwb Cognitive Radio Systems

“…On the other hand, the design is easily expandable, meaning that rejection of more bands is possible by adding extra SRRs or CSRRs (to the feed line or ground) with the appropriate dimensions to obtain the desired notch frequency and width. It is of interest to compare this design to the one in [20], which is based on a reconfigurable bandpass filter. Both antennas can be operated in full UWB mode for channel sensing.…”

“…Both antennas can be operated in full UWB mode for channel sensing. However, the passband filter in [20] results in narrowband operation, which is used for communication over a white space in overlay cognitive radio. A bandstop filter, on the opposite, leads to a narrowband rejection, which is needed when UWB-CR is used in an overlay mode, with adaptive UWB pulses transmitted at high power levels.…”